Troubleshooting-Gaggia-Super-Screen-Flashing
From Whole Latte Love Support Library
If the screen of the machine is flashing then there is a short somewhere inside the machine. If the machine experienced a leak recently, or something was spilled on the machine, it can cause the machine to short out. In any case, a flashing screen indicates that the control board or TAP card has gone bad, and a repair will be necessary.